There are a lot of ways to divide the world--rich and poor, east and west, industrial and agrarian. Now add one more: smoking and nonsmoking. In the U.S. and other developed countries, Big Tobacco is on the run, chased to the curbs by a combination of lawsuits, smoking bans and high taxes. Fewer than 20% of Americans now smoke--the lowest rate since reliable records have been kept. President Barack Obama recently signed laws boosting federal cigarette taxes from 32¢ a pack to $1 and giving the FDA the power to regulate cigarettes like any other food or drug.